Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

The head is the most restrictive part of our engines, no matter the displacement. Just a simple polish of the OE head castings can improve the flow and increase torque and HP. Why is this hard to understand?

The head is the most restrictive part of our engines, no matter the displacement. Just a simple polish of the OE head castings can improve the flow and increase torque and HP. Why is this hard to understand?

I already knew that and i understand, im just asking, he never said what he gained 20whp from so i was confirming that it was in fact from just headwork. By that notion i should make ~215-220whp with headwork and my cai and exhaust considering my car makes anywhere from 190-200 stock

I already knew that and i understand, im just asking, he never said what he gained 20whp from so i was confirming that it was in fact from just headwork. By that notion i should make ~215-220whp with headwork and my cai and exhaust considering my car makes anywhere from 190-200 stock

Sent from my DROID RAZR using Bimmer App

He has stock un-ported heads. Headwork will get you very little gain without support from other mods. The head may be restrictive, but only once you open up the bottle neck of the stock exhaust manifolds and even more-so once you have cams. Headwork would be the very last thing I do to an engine that is breathing as well as it can everywhere else. Otherwise you will see very little gain from your money until you do everything else. Headwork will act like a multiplier to every other N/A mod you do. If you do nothing and only headwork, it will net you almost nothing.

He has stock un-ported heads. Headwork will get you very little gain without support from other mods. The head may be restrictive, but only once you open up the bottle neck of the stock exhaust manifolds and even more-so once you have cams. Headwork would be the very last thing I do to an engine that is breathing as well as it can everywhere else. Otherwise you will see very little gain from your money until you do everything else. Headwork will act like a multiplier to every other N/A mod you do. If you do nothing and only headwork, it will net you almost nothing.

I have built a custom intake and intake box all made of aluminu
And custom strut bar like no other and was thinking of starting to sell
Them to all fanatics check out my pic hard to see till I
Post more close up pics and also pics of fabrication process
Let me know what u think also built custom exhaust all stainless steel
Havent posted pics every thing is tig welded I have weld and fab shop
Thinking of building intake manifold but need to machine the mounting
Flang but dont know where to go from there dont know how
To actualy gain hp by just incressing volume of mani or what need help
From real knoledgable people, research is not cheap.
Really intressted in going in to performane mods and opening
Performance shop.

I have built a custom intake and intake box all made of aluminu
And custom strut bar like no other and was thinking of starting to sell
Them to all fanatics check out my pic hard to see till I
Post more close up pics and also pics of fabrication process
Let me know what u think also built custom exhaust all stainless steel
Havent posted pics every thing is tig welded I have weld and fab shop
Thinking of building intake manifold but need to machine the mounting
Flang but dont know where to go from there dont know how
To actualy gain hp by just incressing volume of mani or what need help
From real knoledgable people, research is not cheap.
Really intressted in going in to performane mods and opening
Performance shop.

Very interested in see your custom manifolds! Need to dyno before and after and see what you can pick up!

That's what i was thinking but he was making it sound like it isnt too hard, but from what i understand the manifold isnt the bottle cap but the actual head is so im wondering why even go through the trouble swapping manifolds if it wasnt pretty simple to swap or worth any real gains

Oh...and the "$300 here, $600 there" scenario will turn into "$3000 here, $6000 there". I've had an enourmous amount of labor put into my car. (Luckily the majority of it was done by myself) Also, I've spent over $5k on my tool set since I started my project. You've been warned...